A SAXS study of silica aerogels

Craievich, A. F.; Aegerter, Michel A.; Santos, Dayse Iara dos; Woignier, Thierry; Zarzycki, J.

doi:10.1016/0022-3093(86)90027-x

Cited by 54 publications

(36 citation statements)

References 7 publications

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“…In the Porod regime, I(q) is given by the power-law equation (11,21,22) I͑q͒ ϭ ␣q -z , [3] where ␣ is a constant. The exponent z is estimated by plotting ln I(q) versus ln q. z can be related to either the mass fractal dimension, D m , or the surface fractal dimension, D s , as…”

Section: Saxs Measurement Of Gelation Process Of Rf Solutionmentioning

confidence: 99%

SAXS Study on Gelation Process in Preparation of Resorcinol–Formaldehyde Aerogel

Tamon

Ishizaka

1998

Journal of Colloid and Interface Science

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Section: Saxs Measurement Of Gelation Process Of Rf Solutionmentioning

confidence: 99%

SAXS Study on Gelation Process in Preparation of Resorcinol–Formaldehyde Aerogel

Tamon

Ishizaka

1998

Journal of Colloid and Interface Science

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“…We calculated the gyration radius R g with Eq. [6] using the preceding XRD data of the stacking width L a and stacking height L c :…”

Section: The Change Of the Primary Micrographite Sizementioning

confidence: 99%

“…The SAXS technique has been used for the characterization of porous solids such as silica gels (5,6) and activated carbons (7)(8)(9). Recently microporous solids have attracted much attention in relation to new technologies and sciences.…”

Section: Introductionmentioning

confidence: 99%

Intrasolid Interfacial Fractality of a Less-Crystalline Solid

Ruike

Murase

Imai

et al. 1998

Journal of Colloid and Interface Science

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“…This approach is justified since during the first stage of the sintering process, the micropores are eliminated by polycondensation reactions (cf. Craievich et al [29]). Because of these reactions, this stage is dominated by diffusion which results in an increase of the skeletal density.…”

Section: Densification Effects Due To Pore Irregularitiesmentioning

confidence: 99%

“…In figure 14 this phenomenon is demonstrated. The unit cell represents a texture model of an aerogel that is formed in a base-catalysed way (after Craievich et al [29]). A characteristic of the matrix material, Le.…”

Section: Densification Effects Due To Pore Irregularitiesmentioning

confidence: 99%

Numerical Simulation of Viscous Sintering by a Periodic Lattice of a Representative Unit Cell

Vorst

1998

Journal of the American Ceramic Society

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In this paper numerical simulations of the viscous sintering phenomenon are presented, i.e. of the process that occurs (for example) during the densification of a porous glass heated to such a high temperature that it becomes a viscous fluid. The numerical approach consists of simulating the shrinkage of a two-dimensional unit cell which is in some sense representative for the porous glass. Hence it is assumed that the microstructure of the glass can be described by a periodic continuation in two directions of this unit cell. In this way it is possible to obtain quite a few theoretical insights of the viscous sintering process with respect to both pore size and pore distribution of the material. In particular this model is able to examine the consequences of microstructures on the evolution of the pore size distribution. It appears that only for higher densities the numerical densification rate of one cylindrical pore in a square unit cell is in agreement with the widely used closed pores model of Mackenzie and Shuttleworth. However, the major finding is that the pores vanish in order of size one afte~another; so the smallest pores first, followed by the larger ones. Moreover it is shown that pores with concave boundary parts may initially grow before they start shrinking at a later time stage.

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A SAXS study of silica aerogels

Cited by 54 publications

References 7 publications

SAXS Study on Gelation Process in Preparation of Resorcinol–Formaldehyde Aerogel

SAXS Study on Gelation Process in Preparation of Resorcinol–Formaldehyde Aerogel

Intrasolid Interfacial Fractality of a Less-Crystalline Solid

Numerical Simulation of Viscous Sintering by a Periodic Lattice of a Representative Unit Cell

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